AEM: Femtosecond laser preparation of high-performance MXene MSCs

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If both sides of the substrate are used to build miniature supercapacitors (MSCs), the capacity of MSCs can be doubled. However, since it is difficult to accurately locate each MSCs pair with two identical MSC units on both sides, it is a huge challenge to realize the electrical connection of MSCs by means of the substrate.

Introduction

Recently, Professor Fang Haitao and Professor Lijun Yang of Harbin Institute of Technology and Researcher Wang Xiaohui of the Institute of Metal Research of the Chinese Academy of Sciences published the topic "Femtosecond Laser-Etched MXene Microsupercapacitors with Double-Side Configuration via Arbitrary On- and Through-Substrate" in the top international journal Advanced Energy Materials. Connections" paper. In this work, the transparent polyethylene terephthalate substrate was etched synchronously by femtosecond laser pulses, and a high-precision serialized double-sided structure formed by back-to-back MSC pairs was obtained and randomly connected by MXene MSC unit substrates. A variety of dual-sided MSC (DSMSC) is realized. The MXene DSMSC prepared by connecting 12 spiral MXene MSC units in series can output an operating voltage of up to 7.2 V. In addition, femtosecond laser etching resulted in the formation of titanium dioxide at the edge of MXene. However, the small area affected by the laser has almost no effect on the performance of the capacitor, which is one of the advantages of femtosecond lasers over traditional lasers. This study has important reference value for the one-step preparation of highly integrated MSCs in miniaturized energy storage systems.

Figure 1 Schematic diagram of the preparation process.

Figure 2 Schematic diagram of laser etching area.

Figure 3 Electrochemical performance of MXene MSC.

Figure 4 Mechanical properties of MSC-10.

Figure 5 Schematic diagram of the preparation of MXene DSMSCs.

Figure 6 Electrochemical performance of MXene DSMSCs.

in conclusion

In summary, highly integrated MXene DSMSCs with arbitrary shapes and outstanding flexibility were prepared by synchronously etching both sides of the transparent substrate by femtosecond laser. The output voltage and capacitance of the prepared MXene DSMSCs have good adjustability. The edge area of the electrode affected by the laser during femtosecond laser etching is less than 1 μm, which has little effect on the capacitance performance of MSCs. MXene DSMSCs prepared with MXene MSC units connected in series can output a working voltage of up to 7.2 V. This work will further contribute to the development of miniaturization of portable electronic products.

Original link:

https://onlinelibrary.wiley.com/doi/full/10.1002/aenm.202000470;

Article source: MXene Academic
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